New! View global litigation for patent families

US6373042B1 - Registration system for a digital printer which prints multiple images on a sheet - Google Patents

Registration system for a digital printer which prints multiple images on a sheet

Info

Publication number
US6373042B1
US6373042B1 US09649645 US64964500A US6373042B1 US 6373042 B1 US6373042 B1 US 6373042B1 US 09649645 US09649645 US 09649645 US 64964500 A US64964500 A US 64964500A US 6373042 B1 US6373042 B1 US 6373042B1
Authority
US
Grant status
Grant
Patent type
Prior art keywords
sheet
edge
image
marking
path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US09649645
Inventor
Deborah M. Kretschmann
William D. Milillo
Dean Thomas
Robert Brutovski
John Shannon
Theodore J. Kellogg
Glenn Herbert
Thomas C. Hatch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/16Means for paper feeding or form feeding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers, thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/008Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers, thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00Typewriters or selective printing or marking mechanisms, e.g. ink-jet printers, thermal printers characterised by the purpose for which they are constructed
    • B41J3/60Typewriters or selective printing or marking mechanisms, e.g. ink-jet printers, thermal printers characterised by the purpose for which they are constructed for printing on both faces of the printing material

Abstract

A printing apparatus places multiple images on a sheet, either by re-feeding the sheet through a duplex path back to a marking device, or by feeding the sheet to successive marking devices. An edge position detector upstream of the marking device determines the location of the sheet so that an image may be precisely placed on the sheet. The system ensures that images on both sides of a sheet are in registration with each other.

Description

INCORPORATION BY REFERENCE

The present specification incorporates by reference U.S. Pat. No. 5,994,711, assigned to the assignee hereof.

FIELD OF THE INVENTION

The present invention relates to office equipment such as printers and copiers, and in particular relates to a system for registering the placement of multiple images on a sheet, such as to print images on both sides of a sheet.

BACKGROUND OF THE INVENTION

Office equipment, such as printers and copiers, which place images based on digital data onto sheets, such as sheets of paper, are well known. More sophisticated types of office equipment are capable of placing images on both sides of a single sheet of paper, a feature often referred to as “duplexing.” A typical configuration of a duplexing printer (the word “printer” including other types of equipment, such as digital copiers and facsimile machines) will include a marking device, meaning some hardware which places a desired image on a sheet, which is capable of printing only on one side of the sheet at a time. In order to print on both sides of the same sheet, it is necessary to feed a sheet through the marking device the first time, so the sheet can receive a first image on one side thereof, and then invert the sheet and re-feed it back into the marking device so that the marking device can place a second image on the other side of the sheet. Although the specific architectures of various office equipment on the market varies widely, the path (along with any associated sheet-handling hardware, such as belts or rollers and motors) by which a sheet which has been output by a the marking device is inverted and re-fed to the marking device can be generally referred to as a “duplex path.” In the market for office equipment having a duplex features, a common customer requirement is a precise registration between an image printed on one side of the sheet with the image printed on the other side. If a single sheet having a images on both sides a thereof is held up to the light, it is desirable that the margins of the two images, particularly if the images include text, be perfectly superimposed. There is therefore a need to provide a system by which the image placed on one side of a sheet by the marking device is registered with the image on the other side of the sheet.

DESCRIPTION OF THE PRIOR ART

U.S. Pat. No. 4,538,905 discloses a basic system in which a location of the side edge of a sheet being fed is precisely measured, and a position of an image placed on the sheet is thereby adjusted.

U.S. Pat. No. 5,994,711, which is incorporated by reference herein, describes a system, including an optical sensor, for the determining the position of a sheet being fed through a system, such as a copier. This precisely determined location is then used to control the marking device, such as an electrophotographic “laser printer,” so that the image can be precisely placed on the sheet in response to the observed position of the sheet entering the marking device. The particular embodiment of this patent shows a preferred system for locating an edge of a sheet being fed, which can take into account of the distance of a sheet from an optical sensor when its position is being determined.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, there is provided a printing apparatus, comprising a marking device, the marking device being capable of placing an image on a sheet fed therein and outputting the sheet; a feed path, for feeding a sheet from a sheet supply to the marking device; and a duplex path, by which a sheet output from the marking device is re-fed to the marking device. A first edge position detector outputs a first edge position signal relating to a location of a side edge of a sheet passing through the feed path, and a second edge position detector outputs a second edge position signal relating to a location of a side edge of a sheet passing through the duplex path. An image placement controller is associated with the marking device and adjusts placement of an image on the sheet in response to at least one of the first edge position signal and the second edge position signal.

According to another aspect of the present invention, there is provided a printing apparatus, comprising a first marking device, the marking device being capable of placing an image on a sheet fed therein, and outputting the sheet, and a second marking device, the marking device being capable of placing an image on a sheet fed therein, and outputting the sheet. A feed path is provided, for feeding a sheet from a sheet supply to the first marking device and then to the second marking device. A first edge position detector, for outputting a first edge position signal relating to a location of a side edge of a sheet passing through the feed path before the first marking device, and second edge position detector outputs a second edge position signal relating to a location of a side edge of a sheet passing through the feed path before the second marking device. An image placement controller is associated with at least one marking device, the image placement controller adjusting placement of an image on the sheet in response to at least one of the first edge position signal and the second edge position signal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing the basic principles of edge registration for sheets being fed into marking device, as known in the prior art;

FIG. 2 is a simplified elevational view of the relevant portions of a duplexing printing apparatus, such as a digital printer or copier, having a duplex path, and incorporating the present invention; and

FIG. 3 is a simplified elevational view of a digital printing apparatus having multiple marking devices therein, incorporating an alternate embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a diagram showing the basic principle of edge registration of a sheet within a printer, as used with the present invention. A sheet S is sent through a path in a process direction indicated as P toward a marking device generally indicated as 10. At a short interval before the sheet is fed through marking device 10 to receive an image thereon, the sheet is caused to pass over, in one particular embodiment, an optical sensor 20, which functions, in terms of the claims below, as an “edge position detector.” There are many possible designs of an optical (or mechanical) sensor 20 and associated system in the art which are capable of determining the position of the side edge of the sheet, but the preferred embodiment of such a sensor is given in the patent incorporated by reference.

The purpose of optical sensor 20 is to determine the precise location of a “side edge” of the sheet S relative to a fixed point within the printer, such as indicated by the distance E. Consistent with the claims below, as used in the specification herein, the edge of the sheet which runs of parallel to the process direction P will be referred to as the “side edge” of the sheet, even if the particular image placed on the sheet causes the “side edge” of the fed sheet to be the top edge or bottom edge relative to the image printed thereon. The optical sensor 20 determines the precise distance E of the edge of the sheet S relative to some fixed point within the machine, and the determination of this distance E is output by a sensor 20 as an “edge position signal,” as the term is used in the claims below (such a signal may be in any form, such as a digital number). In brief, the edge position signal from a particular sensor 20 is symbolic of the measured position of a side edge of the sheet being fed through a path in a process direction.

The edge position signal from is then sent to a control system generally indicated as 14, which is referred to in the claims as an “image placement controller,” which influences the operation of the marking device 10. Marking device 10 can be of any type known in the art, such as an electrophotographic “laser printer” device, or can alternately be an ink jet printer with a reciprocating printhead, or an ink jet printer with a page with printhead. In the case in which marking device 10 is an electrophotographic device, it is typical that the image desired to be printed, which is originally rendered as digital image data, is ultimately placed on the sheet by means of a narrow laser beam which corresponds to a “fast scan direction” which is perpendicular to process direction P. An electrophotographic marking device 10 can respond to the edge position signal from sensor 20 by coordinating its “start of scan” signal, meaning the precise time at which a leading edge of a raster line in an image to be printed starts to create an image, in order to maintain a precise spacing relative to the location of the edge of a sheet, such as when the sheet is receiving an image at the location marked S′.

In the case of an ink jet marking device with a relatively small printhead which reciprocates along fast scan a direction FS shown in the Figure, the signal from a sensor 28 can be used to determine the exact timing of the beginning of the printhead ejections with each printhead scan, once again to ensure a precise placement of the printed image relative to the edge of the sheet. In the case of an ink jet printer (or equivalent device, such as an ionographic head) which includes a printhead which extends the full width of a page, the edge position signal from sensor 20 can be used to determine the exact subset of the ejectors or ejector equivalents which are used to create the image on the sheet S.

Although the description in FIG. 1 shows the basic case in which the exact location of the edge of a sheet is determined by sensor 20, and the information derived therefrom is used for precise placement of an image on the same sheet when the sheet is passed through the marking device 10, it will be apparent that variations on the basic concept are possible. For example, instead of determining the position of the edge of a particular sheet and thereby adjusting the image placement of the image on that particular sheet, it may be more practical to place an image on a particular sheet based on data about the edge locations of sheets which have been previously fed through the path. For instance, it may be desirable to maintain a running average of the positions of previous sheets which happen fed through the path, and use information from previous sheets for the placement of images on subsequent sheet; this general concept rests on the reasonable assumption that a sheet running through the path at a particular time will behave very similarly to a subsequent sheet moving through the path.

FIG. 2 is a simplified elevational view of the relevant portions of a digital printing apparatus, including a duplex path, incorporating the present invention. As in FIG. 1, there is provided a marking device 10, which is, in relevant part, controlled by an image placement controller 14. Sheets on which one or more images are desired to be printed are drawn from a sheet supply stack 12, of a design known in the art, and caused to move through a feed path 16. In addition to a sensor 20 forming an edge position detector, feeding a signal into image placement controller 14, there is provided a second sensor 22 forming a second image position detector. (In the Figure, the sensor 20A represents an alternate location for sensor 20.) The second edge position detector 22 is disposed along a duplex path indicated as 24. Sheets traveling along the feed pass 16 are initially sent through marking device 10 to receive an image on at least one side thereof. For purposes of the claims herein, terms such as “feed path” and “duplex path” are intended to include not only the space defined for passage of sheets therethrough, but also any necessary hardware to cause motion of the sheets for the feed path or duplex path, such as rollers, vacuum transports, belts, diverters, etc. Also, even though the term “duplex path” is used for convenience in some of the claims below, it will be understood that an equivalent of such a duplex path will be apparent in any machine in which a sheet is re-fed through a marking device 10 for any reason, such as to receive a second image thereon (even on the same side thereof).

Disposed along the duplex path 24, in the particular illustrated embodiment, is what can generally be called an “inverter” 26. As is generally known in the art, the function of inverter 26 is in effect to flip over a particular sheet, so that a second side of the sheet can be re-fed to the marking device 10 for placing the second image thereon. The general architecture of a feed path and duplex path shown in the Figure is generally familiar from the Xerox® Document Centre™ 265, which became publicly available in 1997, although other architectures, such as including trays for temporarily storing sheets until they are re-fed, are known in the art.

With particular reference to the present invention, optical sensor 20 acts as an edge position detector for sheets approaching the marking device 10 through feed path 16, while optical sensor 22 acts as an edge position detector for sheets passing through duplex path 24. Sheets passing through duplex loop 24 are typically those sheets which have already been printed on one side thereof by marking device 10, and then inverted in inverter 26, to be sent back to marking device 10 through duplex path 24. Thus, in general, every sheet passing through duplex path 24 will already have thereon one image on a first side thereof, and is approaching marking device 10 to receive a second image on the second, opposite side thereof. A key function of the present invention is to ensure proper registration of the first image on the first side with the second image on the second side.

According to the present invention, the image placement controller 14 responds to signals from both optical detectors 20, 22, and uses this information to control the placement of images on sheets by marking device 10. There are several possible techniques that can be used by image placement controller to achieve registration between a first side image and a second side image on a single sheet. In the preferred embodiment of the invention, two types of image placement control occur: for sheets traveling through feed path 16, a running average of measurements of the location of the side edge for a set of sheets apparatus, such as a running average of the last three sheets, is maintained, and this running average is used to control the placement of images on a subsequent sheet at any particular time. Further, the precise positions of side edges of sheets passing through duplex path 24 is measured by optical sensor 22 and reported to the image placement controller 14; again, a running average of the edge positions of previously-fed sheets can be used for controlling the placement of images on subsequent sheets passing through the duplex path 24. Further, and possibly in addition, by comparing the running averages of the side edge positions of sheets coming through feed path 16 and duplex path 24, a “shift factor,” meaning a mathematical relationship between the relative positions of sheets coming through feed path 16 and the duplex path 24, can be obtained. It is often found that the passage of a sheet through duplex path 24 often results in a side-to-side shift of the sheets passing therethrough, and the shift is fairly consistent for all sheets going through the path in a particular machine. By taking this consistent shift, as symbolized by the calculated shift factor, into account while the printer is running, the image placement controller 14 can control the marking device 10 to ensure registration of the first side image with the second side image on a single sheet.

Although the above-described system of maintaining running averages for the location of the side edges of sheets passing through both feed path 16 and the duplex path 24, and using the running averages to determine the placement of images on a subsequent sheets, is the currently preferred embodiment, other, more computationally sophisticated, techniques can be contemplated. For instance, if the computing power available to the printing apparatus is fast enough, a system can be provided in which for a single sheet, the precise location of the sheet is determined immediately before the sheet is fed into marking device 10, and marking device 10 is controlled to place an image with precision relative to the determined location of the side edge of the sheet; further, when a the same sheet is duplexed, the process can be repeated using the side edge location as determined from the sensor 22 in duplex path 24. Another variation is to use a precise measurement of the side edge location of the sheet being printed in combination with a derived shift factor as determined by the difference in average side edge locations in the feed path 16 and duplex path 24.

Although the various techniques of measurement and image position control shown in FIG. 2 are useful with a duplexing printing apparatus in which the same sheet is passed twice through a single marking device 10, many of the same principles of the invention can be applied to printing apparatus in which a sheet, even at the same side of the sheet, is caused to pass through multiple marking devices, such as in a color printing apparatus. FIG. 3 is a simplified elevational view of a portion of a printing apparatus having two different marking devices, indicated as 10A and 10B. In a practical embodiment, marking device 10A could for example place black marking material on a sheet, while marking device 10B places highlight color marking material, or MICR marking material, on the sheet. The apparatus could further include an inverter 26, which would function largely as in the FIG. 2 example, that is, to make a second side of a sheet available to marking device 10B, for duplex prints.

In the FIG. 3 printing apparatus, sensors 20 and 22 provide signals relating to the precise location of the side edges of sheets passing therethrough, and send these signals to image placement controller 14, which in turn controls image placement of both marking devices 10A and 10B. The same general principles as described above for operation of the image placement controller 14 with the duplex path can similarly be applied to the FIG. 3 apparatus. For instance, controller 14 can derive, based on running averages of the locations of side edges of sheets moving past sensor 20 and sensor 22, a shift factor describing a consistent side-to-side shift of sheets passing between the two sensors; there may well be different types of shift factors depending on whether converter 26 is being used or not, and controller 14 can take this into account. Alternately, controller 14 can detect, through sensor 20 the precise location of the side edge of a sheet 20 just as it is entering marking device 10A, use that information for precise placement of the image, and perform the same function with sensor 22 and marking device 10B.

Claims (20)

What is claimed is:
1. A printing apparatus, comprising:
a marking device, the marking device being capable of placing an image on a sheet fed therein, and outputting the sheet;
a feed path, for feeding a sheet from a sheet supply to the marking device;
a duplex path, by which a sheet output from the marking device is re-fed to the marking device;
a first edge position detector, for outputting a first edge position signal relating to a location of a side edge of a sheet passing through the feed path;
a second edge position detector, for outputting a second edge position signal relating to a location of a side edge of a sheet passing through the duplex path; and
an image placement controller associated with the marking device, the image placement controller adjusting placement of an image on the sheet in response to at least one of the first edge position signal and the second edge position signal.
2. The apparatus of claim 1, the image placement controller adjusting placement of an image on the sheet in response to the first edge position signal and the second edge position signal.
3. The apparatus of claim 1, the image placement controller retaining first edge position signals for a plurality of sheets passing through the feed path and adjusting placement of an image on a subsequent sheet in the feed path based on the retained first edge position signals.
4. The apparatus of claim 3, the image placement controller retaining first edge position signals for a plurality of sheets passing through the feed path and adjusting placement of an image on a subsequent sheet in the feed path based on an average of the retained first edge position signals.
5. The apparatus of claim 1, the image placement controller retaining second edge position signals for a plurality of sheets passing through the duplex path and adjusting placement of an image on a subsequent sheet in the duplex path based on the retained second edge position signals.
6. The apparatus of claim 5, the image placement controller retaining second edge position signals for a plurality of sheets passing through the duplex path and adjusting placement of an image on a subsequent sheet in the duplex path based on an average of the retained second edge position signals.
7. The apparatus of claim 1, the image placement controller retaining first edge position signals for a plurality of sheets passing through the feed path and second edge position signals for a plurality of sheets passing through the duplex path, and determining a shift factor, the shift factor relating to a shift in an edge position associated with at least a portion of the duplex path, and adjusting placement of an image on a subsequent sheet in the duplex path based at least in part on the shift factor.
8. The apparatus of claim 1, the duplex path including means for inverting a sheet output by the marking device before re-feeding the sheet to the marking device.
9. The apparatus of claim 1, the marking device including a charge receptor.
10. The apparatus of claim 1, the marking device including an ink-jet printhead.
11. A printing apparatus, comprising:
a first marking device, the marking device being capable of placing an image on a sheet fed therein, and outputting the sheet;
a second marking device, the marking device being capable of placing an image on a sheet fed therein, and outputting the sheet;
a feed path, for feeding a sheet from a sheet supply to the first marking device and then to the second marking device;
a first edge position detector, for outputting a first edge position signal relating to a location of a side edge of a sheet passing through the feed path before the first marking device;
a second edge position detector, for outputting a second edge position signal relating to a location of a side edge of a sheet passing through the feed path before the second marking device; and
an image placement controller associated with at least one marking device, the image placement controller adjusting placement of an image on the sheet in response to at least one of the first edge position signal and the second edge position signal.
12. The apparatus of claim 11, the image placement controller adjusting placement of an image on the sheet in response to the first edge position signal and the second edge position signal.
13. The apparatus of claim 11, the image placement controller retaining first edge position signals for a plurality of sheets passing through the feed path and adjusting placement of an image on a subsequent sheet in the feed path based on the retained first edge position signals.
14. The apparatus of claim 13, the image placement controller retaining first edge position signals for a plurality of sheets passing through the feed path and adjusting placement of an image on a subsequent sheet in the feed path based on an average of the retained first edge position signals.
15. The apparatus of claim 11, the image placement controller retaining second edge position signals for a plurality of sheets passing through the feed path and adjusting placement of an image on a subsequent sheet in the feed path based on the retained second edge position signals.
16. The apparatus of claim 15, the image placement controller retaining second edge position signals for a plurality of sheets passing through the duplex path and adjusting placement of an image on a subsequent sheet in the duplex path based on an average of the retained second edge position signals.
17. The apparatus of claim 11, the image placement controller retaining first edge position signals and second edge position signals for a plurality of sheets passing through the feed path, and determining a shift factor, the shift factor relating to a shift in an edge position associated with at least a portion of the feed path, and adjusting placement of an image on a subsequent sheet in the feed path based at least in part on the shift factor.
18. The apparatus of claim 11, the feed path including an inverter for inverting a sheet output by the first marking device before feeding the sheet to the second marking device.
19. The apparatus of claim 11, at least one marking device including a charge receptor.
20. The apparatus of claim 11, at least one marking device including an inkjet printhead.
US09649645 2000-08-29 2000-08-29 Registration system for a digital printer which prints multiple images on a sheet Active 2020-11-28 US6373042B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09649645 US6373042B1 (en) 2000-08-29 2000-08-29 Registration system for a digital printer which prints multiple images on a sheet

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09649645 US6373042B1 (en) 2000-08-29 2000-08-29 Registration system for a digital printer which prints multiple images on a sheet
CA 2353075 CA2353075C (en) 2000-08-29 2001-07-10 Registration system for a digital printer which prints multiple images on a sheet
JP2001250833A JP4795578B2 (en) 2000-08-29 2001-08-21 Alignment system for a digital printer for printing a large number of images on the sheet

Publications (1)

Publication Number Publication Date
US6373042B1 true US6373042B1 (en) 2002-04-16

Family

ID=24605668

Family Applications (1)

Application Number Title Priority Date Filing Date
US09649645 Active 2020-11-28 US6373042B1 (en) 2000-08-29 2000-08-29 Registration system for a digital printer which prints multiple images on a sheet

Country Status (3)

Country Link
US (1) US6373042B1 (en)
JP (1) JP4795578B2 (en)
CA (1) CA2353075C (en)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6511239B1 (en) * 2000-11-17 2003-01-28 Xerox Corporation Flyer determination and elimination for side edge electronic registration
US20030116042A1 (en) * 2001-12-20 2003-06-26 Tetsuya Ohba Widthwise paper drift correction device for elongated web-like print paper
EP1439432A1 (en) * 2003-01-15 2004-07-21 Xerox Corporation Adjustable averaging scheme for duplex printing registration
US20040215411A1 (en) * 2003-04-25 2004-10-28 Howe Richard L. Systems and methods for simplex and duplex image on paper registration
US20040251611A1 (en) * 2002-11-05 2004-12-16 Rapkin Alan E. Method for registering sheets in a duplex reproduction machine for alleviating skew
US20050051044A1 (en) * 2003-07-24 2005-03-10 Robert Burkle Gmbh Arrangement for printing flat workpieces
US20050074267A1 (en) * 2003-10-06 2005-04-07 Xerox Corporation Method and apparatus for controlling the velocity of copy substrates during registration
US20050167906A1 (en) * 2004-01-29 2005-08-04 Elliott Delbert L. Method and device to control the alignment of a media sheet in an image forming device
EP1598201A2 (en) * 2004-05-19 2005-11-23 Samsung Electronics Co., Ltd. A paper position correction method for a printer
US20060007293A1 (en) * 2004-07-10 2006-01-12 Samsung Electronics Co., Ltd. Method of printing thermal media by aligning image
EP1621355A1 (en) * 2004-07-30 2006-02-01 Samsung Electronics Co., Ltd. Double-sided printing onto a medium
US20060159480A1 (en) * 2005-01-14 2006-07-20 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
US20070235925A1 (en) * 2006-03-31 2007-10-11 Xerox Corporation Constant lead edge paper inverter system
US20070280711A1 (en) * 2006-06-05 2007-12-06 Kazutoshi Yoshimura Image forming apparatus for forming image on pre-processed sheet
DE102006038459A1 (en) * 2006-08-16 2008-02-21 Eastman Kodak Company Sheet of paper printing method for digital, electro-photographically operated printing machine, involves determining front and rear borders of sheet by sensor for aligning print image in reverse printing before face printing
US20080240820A1 (en) * 2007-03-29 2008-10-02 Xerox Corporation Moving sensor for sheet edge position measurement
US20090020941A1 (en) * 2007-07-18 2009-01-22 Xerox Corporation Sheet registration system with auxiliary nips
US20090309298A1 (en) * 2008-06-12 2009-12-17 Xerox Corporation Systems and methods for determining skew contribution in lateral sheet registration
CN100579790C (en) 2004-07-30 2010-01-13 三星电子株式会社 Method and apparatus for adjusting an image alignment for an image forming apparatus
US20100046033A1 (en) * 2008-08-20 2010-02-25 Xerox Corporation Method to Improve Image on Paper Registration Measurements
US20100067961A1 (en) * 2008-09-18 2010-03-18 Xerox Corporation Use of registration marks to improve image on paper registration performance
US20100123284A1 (en) * 2008-11-19 2010-05-20 Xerox Corporation Translating registration nip systems for different width media sheets
US20100237558A1 (en) * 2009-03-18 2010-09-23 Xerox Corporation Carriage reset for upcoming sheet
US20100276872A1 (en) * 2009-04-29 2010-11-04 Xerox Corporation Early carriage reset move for laterally movable registration device
US20100301547A1 (en) * 2009-05-29 2010-12-02 Xerox Corporation Sheet observer with a limited number of sheet sensors
US20110018193A1 (en) * 2009-07-21 2011-01-27 Xerox Corporation Extended Registration Control of a Sheet in a Media Handling Assembly
US20110075157A1 (en) * 2009-09-29 2011-03-31 Xerox Corporation High resolution linear image sensing using multi-row low resolution image sensor
US20110097125A1 (en) * 2009-10-23 2011-04-28 Xerox Corporation Duplex sheet registration
US20110102817A1 (en) * 2009-10-29 2011-05-05 Xerox Corporation Image on paper registration using image marks
US20110194131A1 (en) * 2010-02-09 2011-08-11 Xerox Corporation Automated positioning of printed images
US20120251132A1 (en) * 2011-03-31 2012-10-04 Xerox Corporation Method of correlating image misregistration
US8649052B2 (en) 2010-06-11 2014-02-11 Xerox Corporation Image on paper registration using transfer surface marks

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5399003B2 (en) * 2008-05-16 2014-01-29 デュプロ精工株式会社 Double-sided printing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6137989A (en) * 1998-04-15 2000-10-24 Xerox Corporation Sensor array and method to correct top edge misregistration

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6322307B2 (en) * 1981-12-11 1988-05-11 Canon Kk
JPH0445071A (en) * 1990-06-08 1992-02-14 Hitachi Koki Co Ltd Duplex printer
JPH07170371A (en) * 1993-12-15 1995-07-04 Canon Inc Image forming device
US5725211A (en) * 1995-08-28 1998-03-10 Xerox Corporation Method and apparatus for registering images on the front and the back of a single sheet of paper
NL1003631C2 (en) * 1996-07-18 1998-01-21 Oce Tech Bv A printing device having the aligning station for printing on both sides of right Laid-receiving sheets.
JP3530722B2 (en) * 1996-10-08 2004-05-24 キヤノン株式会社 Ink jet printing apparatus and an ink jet recording method
JPH10246992A (en) * 1997-03-05 1998-09-14 Canon Inc Image forming device controlling method
JPH11237768A (en) * 1998-02-23 1999-08-31 Ricoh Co Ltd Recorder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6137989A (en) * 1998-04-15 2000-10-24 Xerox Corporation Sensor array and method to correct top edge misregistration

Cited By (70)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6511239B1 (en) * 2000-11-17 2003-01-28 Xerox Corporation Flyer determination and elimination for side edge electronic registration
US20030116042A1 (en) * 2001-12-20 2003-06-26 Tetsuya Ohba Widthwise paper drift correction device for elongated web-like print paper
US6701837B2 (en) * 2001-12-20 2004-03-09 Hitachi Printing Solutions, Ltd. Widthwise paper drift correction device for elongated web-like print paper
US6988725B2 (en) * 2002-11-05 2006-01-24 Eastman Kodak Company Method for registering sheets in a duplex reproduction machine for alleviating skew
US20040251611A1 (en) * 2002-11-05 2004-12-16 Rapkin Alan E. Method for registering sheets in a duplex reproduction machine for alleviating skew
EP1439432A1 (en) * 2003-01-15 2004-07-21 Xerox Corporation Adjustable averaging scheme for duplex printing registration
US6836627B2 (en) 2003-01-15 2004-12-28 Xerox Corporation Mode switch and adjustable averaging scheme for tandem top edge electronic registration
US7277669B2 (en) 2003-04-25 2007-10-02 Xerox Corporation Systems and methods for simplex and duplex image on paper registration
US20040215411A1 (en) * 2003-04-25 2004-10-28 Howe Richard L. Systems and methods for simplex and duplex image on paper registration
US6920307B2 (en) 2003-04-25 2005-07-19 Xerox Corporation Systems and methods for simplex and duplex image on paper registration
US20060099019A1 (en) * 2003-04-25 2006-05-11 Xerox Corporation Systems and methods for simplex and duplex image on paper registration
US7158751B2 (en) 2003-04-25 2007-01-02 Xerox Corporation Systems and methods for simplex and duplex image on paper registration
US20050175383A1 (en) * 2003-04-25 2005-08-11 Xerox Corporation Systems and methods for simplex and duplex image on paper registration
US20050051044A1 (en) * 2003-07-24 2005-03-10 Robert Burkle Gmbh Arrangement for printing flat workpieces
US7127992B2 (en) * 2003-07-24 2006-10-31 Robert Burkle Gmbh Arrangement for printing flat workpieces
US20050074267A1 (en) * 2003-10-06 2005-04-07 Xerox Corporation Method and apparatus for controlling the velocity of copy substrates during registration
US6920308B2 (en) 2003-10-06 2005-07-19 Xerox Corporation Method and apparatus for controlling the velocity of copy substrates during registration
US20050167906A1 (en) * 2004-01-29 2005-08-04 Elliott Delbert L. Method and device to control the alignment of a media sheet in an image forming device
US7222848B2 (en) * 2004-01-29 2007-05-29 Lexmark International, Inc. Method and device to control the alignment of a media sheet in an image forming device
EP1598201A2 (en) * 2004-05-19 2005-11-23 Samsung Electronics Co., Ltd. A paper position correction method for a printer
EP1598201A3 (en) * 2004-05-19 2006-09-20 Samsung Electronics Co., Ltd. A paper position correction method for a printer
US20060007293A1 (en) * 2004-07-10 2006-01-12 Samsung Electronics Co., Ltd. Method of printing thermal media by aligning image
US7333122B2 (en) 2004-07-10 2008-02-19 Samsung Electronics Co., Ltd. Method of printing thermal media by aligning image
US20060023057A1 (en) * 2004-07-30 2006-02-02 Samsung Electronics Co., Ltd. Method and apparatus for adjusting an image alignment for an image forming apparatus
US7295223B2 (en) 2004-07-30 2007-11-13 Samsung Electronics Co., Ltd. Method and apparatus for adjusting an image alignment for an image forming apparatus
CN100579790C (en) 2004-07-30 2010-01-13 三星电子株式会社 Method and apparatus for adjusting an image alignment for an image forming apparatus
EP1621355A1 (en) * 2004-07-30 2006-02-01 Samsung Electronics Co., Ltd. Double-sided printing onto a medium
EP1688265A3 (en) * 2005-01-14 2006-11-29 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
US20060159480A1 (en) * 2005-01-14 2006-07-20 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
US7860425B2 (en) 2005-01-14 2010-12-28 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
US20090252523A1 (en) * 2005-01-14 2009-10-08 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
KR100799430B1 (en) 2005-01-14 2008-01-30 캐논 가부시끼가이샤 Printing System and Job Processing Method
US7440709B2 (en) 2005-01-14 2008-10-21 Canon Kabushiki Kaisha Printing system, job processing method, and storage medium
US20070235925A1 (en) * 2006-03-31 2007-10-11 Xerox Corporation Constant lead edge paper inverter system
US20070280711A1 (en) * 2006-06-05 2007-12-06 Kazutoshi Yoshimura Image forming apparatus for forming image on pre-processed sheet
EP1865704A3 (en) * 2006-06-05 2008-04-16 Konica Minolta Business Technologies, Inc. Image forming apparatus for forming image on a pre-processed sheet
EP1865704A2 (en) 2006-06-05 2007-12-12 Konica Minolta Business Corporation, Inc. Image forming apparatus for forming image on a pre-processed sheet
DE102006038459A1 (en) * 2006-08-16 2008-02-21 Eastman Kodak Company Sheet of paper printing method for digital, electro-photographically operated printing machine, involves determining front and rear borders of sheet by sensor for aligning print image in reverse printing before face printing
DE102006038459B4 (en) * 2006-08-16 2009-05-07 Eastman Kodak Company A method for printing a sheet in perfecting
US20080240820A1 (en) * 2007-03-29 2008-10-02 Xerox Corporation Moving sensor for sheet edge position measurement
US8056897B2 (en) 2007-03-29 2011-11-15 Xerox Corporation Moving sensor for sheet edge position measurement
US7731188B2 (en) 2007-07-18 2010-06-08 Xerox Corporation Sheet registration system with auxiliary nips
US20090020941A1 (en) * 2007-07-18 2009-01-22 Xerox Corporation Sheet registration system with auxiliary nips
US20090309298A1 (en) * 2008-06-12 2009-12-17 Xerox Corporation Systems and methods for determining skew contribution in lateral sheet registration
US7914001B2 (en) 2008-06-12 2011-03-29 Xerox Corporation Systems and methods for determining skew contribution in lateral sheet registration
US20100046033A1 (en) * 2008-08-20 2010-02-25 Xerox Corporation Method to Improve Image on Paper Registration Measurements
US8170456B2 (en) 2008-09-18 2012-05-01 Xerox Corporation Method and system for improving image on paper registration in an image printing system
US20100067961A1 (en) * 2008-09-18 2010-03-18 Xerox Corporation Use of registration marks to improve image on paper registration performance
US7845635B2 (en) 2008-11-19 2010-12-07 Xerox Corporation Translating registration nip systems for different width media sheets
US20100123284A1 (en) * 2008-11-19 2010-05-20 Xerox Corporation Translating registration nip systems for different width media sheets
US20100237558A1 (en) * 2009-03-18 2010-09-23 Xerox Corporation Carriage reset for upcoming sheet
US8448943B2 (en) 2009-03-18 2013-05-28 Xerox Corporation Carriage reset for upcoming sheet
US20100276872A1 (en) * 2009-04-29 2010-11-04 Xerox Corporation Early carriage reset move for laterally movable registration device
US7959150B2 (en) 2009-04-29 2011-06-14 Xerox Corporation Early carriage reset move for laterally movable registration device
US8109506B2 (en) 2009-05-29 2012-02-07 Xerox Corporation Sheet observer with a limited number of sheet sensors
US20100301547A1 (en) * 2009-05-29 2010-12-02 Xerox Corporation Sheet observer with a limited number of sheet sensors
US8376358B2 (en) 2009-07-21 2013-02-19 Xerox Corporation Extended registration control of a sheet in a media handling assembly
US20110018193A1 (en) * 2009-07-21 2011-01-27 Xerox Corporation Extended Registration Control of a Sheet in a Media Handling Assembly
US8047537B2 (en) 2009-07-21 2011-11-01 Xerox Company Extended registration control of a sheet in a media handling assembly
US7990528B2 (en) 2009-09-29 2011-08-02 Xerox Corporation High resolution linear image sensing using multi-row low resolution image sensor
US20110075157A1 (en) * 2009-09-29 2011-03-31 Xerox Corporation High resolution linear image sensing using multi-row low resolution image sensor
US8494431B2 (en) 2009-10-23 2013-07-23 Xerox Corporation Duplex sheet registration
US20110097125A1 (en) * 2009-10-23 2011-04-28 Xerox Corporation Duplex sheet registration
US20110102817A1 (en) * 2009-10-29 2011-05-05 Xerox Corporation Image on paper registration using image marks
US8553280B2 (en) 2009-10-29 2013-10-08 Xerox Corporation Image on paper registration using image marks
US20110194131A1 (en) * 2010-02-09 2011-08-11 Xerox Corporation Automated positioning of printed images
US8767220B2 (en) 2010-02-09 2014-07-01 Xerox Corporation Automated positioning of printed images
US8649052B2 (en) 2010-06-11 2014-02-11 Xerox Corporation Image on paper registration using transfer surface marks
US8843002B2 (en) * 2011-03-31 2014-09-23 Xerox Corporation Method of correlating image misregistration
US20120251132A1 (en) * 2011-03-31 2012-10-04 Xerox Corporation Method of correlating image misregistration

Also Published As

Publication number Publication date Type
CA2353075A1 (en) 2002-02-28 application
CA2353075C (en) 2005-04-12 grant
JP4795578B2 (en) 2011-10-19 grant
JP2002172773A (en) 2002-06-18 application

Similar Documents

Publication Publication Date Title
US6234694B1 (en) Media control to eliminate printing images beyond the media boundaries
US6065383A (en) Punching system
US5091754A (en) Image forming apparatus comprising lateral movement means
US20080124158A1 (en) Double reflex printing
US20050269759A1 (en) Sheet feeding apparatus and method of detecting double feed
US7671878B2 (en) Thermal printer and paper recognition method
US6650864B2 (en) Printing system
US5725211A (en) Method and apparatus for registering images on the front and the back of a single sheet of paper
US5864774A (en) Method for calibrating position of a printed image on a final receiving substrate
US6118950A (en) Duplex image alignment
US5287158A (en) Image forming apparatus with image reading unit
US6501929B1 (en) Printing system for printing a recording medium using two printers, and a method for operating such a printing system
US7177585B2 (en) Image forming apparatus and method
US5342715A (en) Color printer having reduced first copy out time and extended photoreceptor life
US20010049990A1 (en) Punching system
US6758471B2 (en) Apparatus and method for sheet transport control
US6799507B2 (en) Web printers
JPH11348373A (en) Ink jet recorder
US4893135A (en) Laser printer with position registration enhancement
US20030095722A1 (en) Method and apparatus to detect and compensate for skew in a printing device
US20080038004A1 (en) Image forming apparatus
US6836640B2 (en) Sheet conveying apparatus and image forming apparatus
US20060033943A1 (en) Print method and print apparatus
US20060269339A1 (en) Image printing apparatus
US20070138738A1 (en) Sheet carrying unit, image forming apparatus and sheet carrying control method

Legal Events

Date Code Title Description
AS Assignment

Owner name: XEROX CORPORATION, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KRETSCHMANN, DEBORAH M.;MILILLO, WILLIAM D.;THOMAS, DEAN;AND OTHERS;REEL/FRAME:011140/0313

Effective date: 20000817

AS Assignment

Owner name: BANK ONE, NA, AS ADMINISTRATIVE AGENT, ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNOR:XEROX CORPORATION;REEL/FRAME:013153/0001

Effective date: 20020621

AS Assignment

Owner name: JPMORGAN CHASE BANK, AS COLLATERAL AGENT, TEXAS

Free format text: SECURITY AGREEMENT;ASSIGNOR:XEROX CORPORATION;REEL/FRAME:015134/0476

Effective date: 20030625

Owner name: JPMORGAN CHASE BANK, AS COLLATERAL AGENT,TEXAS

Free format text: SECURITY AGREEMENT;ASSIGNOR:XEROX CORPORATION;REEL/FRAME:015134/0476

Effective date: 20030625

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12

AS Assignment

Owner name: XEROX CORPORATION, NEW YORK

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:BANK ONE, NA;REEL/FRAME:034671/0753

Effective date: 20030625

Owner name: XEROX CORPORATION, NEW YORK

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:JPMORGAN CHASE BANK, N.A.;REEL/FRAME:034672/0921

Effective date: 20061204